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Fraipontite

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Fraipontite is a zinc aluminium silicate mineral with a formula of (Zn,Al)3(Si,Al)2O5(OH)4.[1][2]

Pockets of minute pearly white fraipontite crystals with green smithsonite from Laurium, Greece (size: 1.4 x 1.0 x 0.9 cm)

It is a member of the kaolinite-serpentine mineral group and occurs as an oxidation product of zinc deposits. It occurs with smithsonite, gebhardite, willemite, cerussite and sauconite.[1]

It was first described in 1927 for an occurrence in Vieille Montagne, Verviers, Liège Province, Belgium.[2] It was named for Julien Jean Joseph Fraipont (1857-1910), and Charles Fraipont, geologists of Liege, Belgium.[3] In addition to the type locality in Belgium, it has been reported from Tsumeb, Namibia; Laurium, Greece; Swaledale, North Yorkshire, England; the Silver Bill mine, Cochise County, Arizona, the Blanchard Mine, Socorro County, New Mexico and the Mohawk mine, San Bernardino County, California in the USA; and from the Ojuela mine, Mapimi, Durango, Mexico.[1]

A synonym for fraipontite is zinalsite which was reported in 1956 for an occurrence in Kazakhstan.[4][5]

References

  1. ^ a b c Handbook of Mineralogy
  2. ^ a b Mindat.org
  3. ^ Webmineral data for fraipontite
  4. ^ Zinalsite on Webmineral
  5. ^ Zinalsite on Mindat
 

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